With the achieved calorific value profile of just Uf = 0.92 W / m2K, it is possible, and with the standard steel reinforcement and 3-layer glass, the value of Ug = 0.6 W / m2K, window value Uw = 0,78 W / m2K is achieved.
Investment in windows suitable for passive houses will be returned through the potential energy savings that windows give a short period of time.
The system is optimized for working with STV technology which allows the creation of larger and more stable static elements. Gluing glass profile wings is transferred to glass strength to the wing, and the whole system becomes more stable. Therefore, the standard elements can be entirely without steel, a combination STV®-techniques with the standard steel reinforcement allows the creation of so far unfeasible size elements. Gluing glass and sash improves the antitheft device, because the pressure on the element is so more difficult.
And after long use windows with STV®- technique are closing as safe.